I'm guessing bro gets drained before shooting and can't get it up. And she probably changed the scenes so she doesn't actually have to play it out the way he expects
EDIT - I didn't mention this before, but I thought about it quite a bit. Throughout the story, Yoshio has been portrayed as the initiator, and pretty much the top in the relationship.
She initiated the cheating/affair, and realistically had all control.
So my guess is the change in the script will be that Yoshio (or the character she plays as), will be the initiator, adding a twist element. That in combination of "Villain" drained and cant get it up might be complete destruction.
Wild guess
Someone mentioned that there was no point in all the side-cut scenes of villain imagining fucking Yoshio, and at this stage I completely agree.
I first assumed this was going to be a close-call for her, to humble her, since she is pretty much the root cause of the affair in the first place, and it was going to be a wake-up call for her to realize how much she hurt others for her behavior. But at this point, it just looks like its designed to shit on a character who pretty much doesn't even need to be there, and its become cringe worthy as a result